WO2008069086A1 - Dental magnetic attachment - Google Patents

Abstract

Provided is a dental magnetic attachment (2) comprising a magnetic structure (5) disposed in a dental plate (4), and a keeper (11) made of a magnetic material for mounting the magnetic structure removably. The magnetic structure (5) and the keeper (11) are connected by a ball joint structure. The magnetic structure (5) has its body made of a rare earth magnet and covered all over its surface with a thin film of magnetic stainless steel or a metal film of a gold or silver plating film. The keeper (11) is constituted to include a head portion (8) made of magnetic stainless steel and formed to have a spherical or semispherical shape, and a fixed supporting portion (10) fixed into the position of a dental root (9). A spherical recess (5b) to be fitted on the head portion (8) of the keeper (11) is formed in the side of the magnet structure (5).

Description

 Specification

 Dental magnetic attachment

 Technical field

 [0001] The present invention relates to a magnetic attachment that removably fixes a denture to a keeper using a magnetic adhesion force, and more specifically, eliminates the displacement of the denture during occlusion, and provides a comfortable denture mounting state. The present invention relates to a magnetic attachment that can be held.

 Background art

 Conventionally, in dental treatment, a magnetic attachment using magnetic adhesion has been proposed because of the advantages that dentures can be easily attached and detached and the fixed state at the time of attachment is strong. As shown in FIGS. 13 and 14, the basic structure of this magnetic attachment is that the magnetic structures c, c... Of the denture base b in which the tooth part a is implanted are used as the root of the alveolar bone d or the artificial root e. Each of the fixed keepers f, f... Is magnetically attached to the denture g and fixed.

 However, in the conventional magnetic attachment as described above, the attracting surface cl of the magnet structures c, c... And the attracted surface fl forces of the keepers f, f. Therefore, in the denture formation process, the surface attachment state with high accuracy between the suction surface cl and the suction surface fl was maintained according to the size, strength, and tilt state of the root at different treatment positions for each patient. As such, it requires an advanced technique that the corresponding magnet structure c and keeper f must be buried. Even if the denture treatment was completed in the best condition, the occlusal pressure in the left-right direction X, vertical direction Y, and front-rear direction Z associated with the bite was complicatedly combined in the actual use of the denture. When the denture moves, there is a gap due to “slip” between the facing surfaces cl and f 1 of the keeper f and the magnet structure c, and the magnetic force changes significantly each time the occlusal movement is performed. As a result, it is impossible to maintain a stable fixed state of the denture g. Furthermore, when the denture g is used for a long period of time, the life, replacement, and adjustment time of the denture g will be shortened due to the mutual wear caused by friction between the keeper f and the magnet structure c. It had a drawback.

[0004] Therefore, a denture that does not cause a gap between the magnet structure and the keeper during the fitting. Has been proposed (Patent Document 1). In the above proposal, the adsorption surface of the magnet structure and the attracted surface of the keeper are formed in a spherical shape that is symmetrical with each other, so that the denture can swing and rotate appropriately. For the above-mentioned complicated combination of occlusal pressures with different directions, the magnetic attachment does not respond smoothly to the movement of the denture, and it is still impossible to maintain a stable denture wearing state. It was.

 [0005] Patent Document 2 discloses a denture attachment similar to Patent Document 1. However, both the attracting surface and the attracted surface are formed from extremely gentle curved surfaces, and have the same drawbacks as in Patent Document 1.

[0006] In Patent Document 3, a ball head is described in paragraph No. 0038 and FIG. 8, and the ball head is mounted in a sleeve like a polygonal head (FIG. 7) and the like. Yes, swinging and turning of the denture is restricted by the sleeve.

[0007] The head of the fixed nail disclosed in Patent Document 4 is held by a cylindrical magnet or a cylindrical elastic body. Like Patent Document 3, the denture swings and rotates. Be regulated.

[0008] Patent Document 5 uses a cut sphere, and the swinging and turning of the denture is restricted by the flat portion of the cut sphere and the flat surface of the keeper.

[0009] Patent Document 6 discloses a configuration of a dental magnetic member holder, which is completely described in terms of the configuration of the entire magnetic attachment! /, N! /. Patent Document 1: Japanese Patent Laid-Open No. 2002-282281

 Patent Document 2: JP 2004-16557 A

 Patent Document 3: Japanese Patent Laid-Open No. 7-23983

 Patent Document 4: Utility Model Registration No. 3054058

 Patent Document 5: Japanese Patent Publication No. 3-19782 (Japanese Patent Publication No. 62-503152)

 Patent Document 6: Japanese Patent Laid-Open No. 11 244308

 Disclosure of the invention

 Problems to be solved by the invention

[0010] The present invention is a completely novel use of a ball joint structure as a magnetic attachment. From a viewpoint, the aim is to provide a magnetic attachment that combines a fixed state when a denture is mounted and a flexible posture change with occlusal pressure.

 Means for solving the problem

The present invention provides a magnet structure provided on a denture base, a magnetic material keeper to which the magnet structure is attached, and a dental magnetic attachment that also has a force. A dental magnetic attachment characterized by being connected by a joint structure.

 [0012] In one aspect, the ball joint structure is formed in any one of a spherical shape, a hemispherical shape, or a hemispherical shape to a full spherical shape, which is formed on one of the magnet structure and the keeper. A spherical convex portion, and a spherical concave portion that is in contact with the spherical convex portion and is formed on the other of the magnet structure and the keeper.

[0013] In one embodiment, the spherical convex portion has a diameter of 1 mm to 8 mm. In one preferred embodiment, the spherical convex portion has a diameter of 3 mm to 5 mm. If the ball joint structure allows the magnet structure to rotate freely with respect to the keeper, the size of the spherical convex portion may be small. However, in order to ensure sufficient magnetic attraction, the spherical convex portion The contact area between the portion and the spherical recess is preferably large. Needless to say, the diameter of the spherical convex portion is limited by the size of the denture. Further, it is easily understood that the size of the spherical concave portion is substantially equal to the size of the corresponding spherical convex portion.

 [0014] In one aspect, the keeper includes a spherical head having a spherical shape or a spherical shape of any shape between a whole sphere or a hemisphere or between a hemisphere and a whole sphere, and a fixed support portion for attaching to a root position. Thus, the magnet structure has a spherical concave portion that comes into surface contact with the spherical convex portion.

[0015] In one aspect, the magnet structure has a spherical protrusion of any shape of a full sphere or a hemisphere, or any shape between a hemisphere and a full sphere, and the keeper includes the spherical The head is provided with a spherical concave portion that comes into surface contact with the convex portion, and a fixed support portion that is attached to the root position. By forming a spherical recess on the keeper side, when the denture is mounted on the keeper, the center of gravity of the denture is lowered and the mounting of the denture is stabilized. [0016] In one aspect, the keeper includes a head that is formed of a spherical projection of any shape of a full sphere or a hemisphere, or any shape between the hemisphere and the full sphere, and a tooth adjacent to the attachment position of the denture. A fixed support portion extending in a horizontal direction from a metal portion of the crown prosthesis, and the magnet structure has a spherical concave portion in surface contact with the spherical surface of the head.

 [0017] In one aspect, the magnet structure has a spherical protrusion of any shape of a full sphere or a hemisphere, or any shape between a hemisphere and a full sphere, and the keeper includes the spherical The head includes a surface contact spherical concave portion on the convex portion, and a fixed support portion extending in the horizontal direction from the metal portion of the crown prosthesis adjacent to the attachment position of the denture.

 [0018] In one aspect, when the denture is mounted in the mouth, the magnet for the keeper is between the peripheral surface area of the spherical convex portion and the peripheral surface area of the spherical concave portion. The required gap that allows the structure to swing is formed. In this way, it is possible to roll the denture when it is put together.

 [0019] In one aspect, the magnet structure includes a structure main body made of a rare earth magnet and a metal film provided over the entire outer surface of the structure main body. In one embodiment, the metal film is a metal film made of one or a plurality of combinations selected from magnetic stainless steel, gold, silver, titanium, and molybdenum.

 [0020] In one aspect, at least a portion of the keeper connected to the magnet structure is made of magnetic stainless steel. In one example, the entire keeper is formed from magnetic stainless steel.

 The invention's effect

[0021] According to the present invention, the magnet structure and the keeper form a ball joint structure to fix the denture, so that the occlusal pressure complicatedly combined with the squeezing acts on the keeper via the denture. However, the denture mounting position does not shift, and the magnet structure swings moderately around the head of the keeper. Can be done. Even when the root direction differs depending on the treatment site, the magnet structure and the keeper, which form the ball joint structure, are always coupled with the optimal position and posture. The parallelism between the magnetized surfaces of the structure and the keeper must be V, Chi! /, And precise! / ヽ Such troublesome preparation work can be eliminated. Moreover, as compared with the conventional case where the flat portions are magnetically attached, the spherical body and the spherical concave portion are magnetically attached, so that a larger magnetic attachment area can be secured, and a firm fixed state in a limited treatment site can be secured. Can be secured. BEST MODE FOR CARRYING OUT THE INVENTION

 [0022] In the present invention, a magnet structure embedded on the denture side and a keeper embedded on the alveolar bone side are coupled by a detachable ball joint structure.

 The configuration of the present invention will be described in detail based on the first embodiment shown in the drawings. In FIG. 1, 1 is a denture that employs the magnetic attachment 2 of the present invention, and the total denture 1 is configured by integrally forming a tooth portion 3 on a denture base 4. A plurality of magnet structures 5 are embedded in the inner position of the denture base 4. In the alveolar bone 7 forming the gingiva 6, keepers 11 are embedded in portions corresponding to the magnet structures 5, 5,. The keeper 11 includes a spherical head 8 and a fixed support portion 10 that enters the root portion 9 position. The magnet structure 5 and the keeper 11 cooperate to function as the magnetic attachment 2.

 [0024] As shown in Fig. 2 (a), the spherical head 8 of the keeper 11 has the shape of a whole sphere made of magnetic stainless steel (SUS306, SUS316, etc.), and a tapered screw is screwed. It is integrally formed with the fixed support 10 provided. A hexagonal groove 8a is engraved on the top of the sphere head 8, and the keeper 11 can be attached and removed by screwing and unscrewing operation with a hexagon wrench through the groove 8a. ing. Here, the spherical head 8 is not limited to the above-mentioned shape, but as shown in FIG. 5B, a hemispherical spherical head 8 ′ in which a skirt portion 8b is integrally extended is used. As shown in the figure (c) and (d), the spherical heads 8 and 8 ′ and the fixed support portion 10 ′ with screws are separately configured. The keeper 11 may be configured to be fixed to the root portion 9 through the fixing support portion 10 ′ in the through hole 12 with a base drilled in 8 ′.

[0025] As shown in FIGS. 3 (a) and 3 (b), the magnet structure 5 is a structure body made of a rare earth magnet (Nd—Fe—B system: neodymium 'iron * boron magnet is used in the embodiment). Has 5a. The structural body 5a has a truncated cone shape, and a spherical recess 5b for fitting the spherical head 8 of the keeper 11 is formed at the center of the bottom surface. A thin film 13 of magnetic stainless steel is deposited on the entire outer surface of the structure body 5a. The magnet structure is shown in the figure (c), (d ), A spherical recess 5b is formed at the center position of the bottom surface of the structure body 5a 'formed in a cylindrical shape, and a portion located on the base surface 5c side of the deposited thin film 13 is outward. If the magnet structure 5 ′ is configured so as to extend to form the flange portion 13a, it can be prevented from coming off when the magnet structure 5 ′ is embedded in the denture base 4. Further, instead of the magnetic stainless steel thin film 13 described above, metal plating such as gold or silver may be applied to the entire outer surface of the structure body 5a.

[0026] In addition, in the process of forming the complete denture 1, a plurality of magnet structures 5 configured as described above are embedded in a predetermined portion at the inner position thereof. The magnet structure 5 does not come out of the denture base 4 by repeated attachment and detachment of the complete denture 1 because it is formed in a truncated cone shape that expands in the direction of the diameter. 3 (c) and 3 (d) show a configuration in which the thin film 13 deposited on the base surface 5c side of the structure body 5 is extended outward to form the flange 13a. Although not limited thereto, it may be configured so that the outer peripheral surface of the magnet structure 5 is provided with unevenness, or a plurality of protrusions are integrally formed to prevent removal.

 [0027] Next, mounting of the complete denture 1 will be described. In FIG. 4, the complete denture 1 has a plurality of keepers 11 attached to the root portion 9 on the side of the alveolar bone 7 before each placement, in each treatment site (in the example, the left and right canine positions on the dental arch and the first teeth The magnetic attachment 2 is buried in advance in the denture base 4 by embedding the magnetic structures 5, 5,... Corresponding to the respective keepers 11, 11,. The prepared complete denture 1 is formed. In the formation process

The point that the complete denture 1 is constructed through the examination of the tooth profile and alveolar bone shaping, the occlusion adjustment of the completed denture, the alignment of teeth, and the mixing of teeth, etc., is no different from the conventional dental technician process.

 [0028] Then, when the complete denture 1 completed as described above is mounted, as shown in FIG. 5 (a), the spherical recess 5b of each magnet structure 5 is provided on the spherical head 8 of the keeper 11, respectively. The complete denture 1 is firmly fixed to each keeper 11 through the magnetic attachment force to the spherical head 8 of the magnet structure 5.

[0029] In the mounted state of the complete denture 1, the outer peripheral surface area S1 of the sphere head 8 of the keeper 11 and the spherical recess 5b of the magnet structure 5 as shown in FIG. A gap t is formed between the peripheral surface area S 2 and the magnet structure 5 around the spherical head 8 is allowed to swing. Yes. Therefore, as shown in (c) and (d) of the figure, even if the occlusal pressure P, which is complicatedly combined with the squeezing, acts on the keeper 11 via the complete denture 1, the mounting position of the complete denture 1 The magnet structure 5 that does not cause a deviation swings around the sphere head 8 of the keeper 11, thereby maintaining a secure fixed denture 1 while maintaining a smooth fit. That's the power S.

 [0030] Here, the advantages of the magnetic attachment 2 of the present invention are particularly demonstrated for treatment sites where the positions and postures of the tooth root portions 9a and 9b are different, as shown in FIGS. 6 (a) and 6 (b). Will be. In other words, in the root portions 9a and 9b at the A-A position (in the embodiment, the left and right second molar positions), the root portion 9a that is almost upright and the root portion 9b that is inclined are respectively The spherical head 8 of the keeper 11 embedded in the keeper 11 can uniformly receive the occlusal pressure with respect to the magnet structure 5 on the complete denture 1 side. In the conventional magnetic attachment shown in FIG. 2 (c), the attracted surface fl of the keeper f inclined according to the inclination posture of the root portion and the attracted surface cl of the magnet structure c magnetically attached to the attracted surface cl It is necessary to form the denture while making precise adjustments to the face-mounted state.In addition, when using the completed denture, the keeper will be able to cope with the movement of the denture that is complexly combined with the occlusal pressure associated with the bite. Although “slip” occurs between the facing surfaces cl and fl of f and the magnet structure c, in the present invention, the complete denture 1 can be reliably fixed by the ball joint structure of the magnet structure 5 and the keeper 11. Therefore, the “slip” as described above does not occur at all, and the magnetic structure 5 and the keeper 11 can be adjusted only by adjusting the fitting position of the spherical recess 5b with respect to the spherical head 8. Precise adjustment of position and position on the side No work is required.

 FIGS. 7 (a) to (g) show other configurations of the keeper. In this example, the shape of a whole sphere or hemisphere in which the hexagonal groove portion 14a and the screw portion 14b are integrally formed. A keeper 18 is formed by screwing a head 15 having a pedestal portion 16 into a female threaded portion 17a of a fixed support portion 17 having a truncated cone shape integrally formed with a pedestal portion 16, and the keeper 18 driven into the root portion 9 is configured. The complete denture 1 is attached through the magnet structure 5. In this example, only the head 15 can be easily replaced with the keeper 18 attached to the tooth root 9.

FIG. 8 shows a second embodiment according to the present invention, in which an all-spherical body in which a hexagonal groove portion 19a and a screw portion 19b are integrally formed on the denture base 4 that forms the complete denture 1 Or hemisphere The magnet structure 19 having the shape is provided, and a spherical convex portion is formed. A keeper 23 is formed by a head portion 21 made of magnetic stainless steel having a spherical recess 20 into which the magnet structure 19 is fitted, and a fixed support portion 22 that enters the root portion 9 in the alveolar bone 7. The magnet structure 19 and the keeper 23 cooperate to function as a magnetic attachment.

[0033] Similar to the magnet structure 5, the magnet structure 19 is composed of a rare earth magnet (in the embodiment, Nd-Fe-B system: neodymium 'iron' boron magnet is used), Steel thin film and metal plating such as gold and silver are deposited. The magnet structure 19 is configured to be detachably attached to the denture base 4 by screwing and unscrewing operations with a hexagon wrench through a hexagonal groove 19a.

 [0034] When the complete denture 1 is attached, as shown in FIGS. 9 (a) and 9 (b), each magnet structure 19 is fitted into the spherical recess 20 of the keeper 23, and the magnet structure The complete denture 1 is firmly fixed to each keeper 23 through the magnetized force to 19. In such a mounting state of the complete denture 1, a gap t is formed between the outer peripheral surface area S1 of the spherical recess 20 forming the keeper 23 and the peripheral surface area S2 of the magnet structure 19. Thus, the magnet structure 19 is allowed to swing around the spherical recess 20 formed in the head 21 of the keeper 23. Therefore, as shown in (c) and (d) of the figure, even if the occlusal pressure combined with the squeezing is applied to the keeper 23 via the complete denture 1, the mounting position of the complete denture 1 The magnet structure 19 that does not cause a slippage swings around the head 21 of the keeper 23, so that the smooth densification can be performed stably while maintaining the secure fixed state of the complete denture 1. Is possible.

FIGS. 10 and 11 show a third embodiment of the present invention. In this example, a configuration in which the partial denture 24 is mounted using the magnetic attachment of the present invention is shown. . In particular, when there is a collapse of the root or lack of strength, or when a denture is attached to a missing tooth, instead of the conventional partial denture, bridge, etc., the partial denture is adjacent to the adjacent crown without using the root. We propose partial dentures that can be detachably mounted using a prosthesis. The partial denture 24 is made up of the keepers 25 and 25 to which the dental prosthesis 24 is attached, a head 26 having a full or hemispherical shape made of magnetic stainless steel, and a crown prosthesis adjacent to the mounting position of the partial denture 24 (mostly Crush) 27 and 28 metal parts 27a and 28a horizontally It consists of metal fixed support parts 29, 29 extending in the direction. The denture base 30 of the partial denture 24 is embedded with a magnet structure 32 that forms a spherical recess 31 that fits into the head portion 26 of the keeper 25, as in the above-described embodiment. The body 32 cooperates to function as a magnetic attachment 33.

 [0036] The crown prosthesis 27 that integrally extends the fixed support portion 29 of the keeper 25 has a porcelain baked crown structure as shown in FIGS. Ll (a) to (d). On the outer surface of the metal part 27a covering the unsupported abutment tooth, dental porcelain 27b formed by layering of opaque porcelain, body porcelain and enamel porcelain is baked. A keeper 25 is configured by detachably screwing a head 26 having the same structure as the head 15 shown in FIG. The crown prosthesis 28 is also configured to have the same internal structure although the external shape is different from the crown prosthesis 27.

 [0037] The magnet structure 32 embedded in the denture base 30 of the partial denture 24 is formed by depositing a thin film of magnetic stainless steel or a metal plating such as gold or silver over the entire outer surface, and the center position of the bottom surface thereof. A spherical recess 31 for fitting the head 26 of the keeper 25 is formed in the body.

 Therefore, when the partial denture 24 configured as described above is mounted in the mouth, the partial denture 24 is attached to the heads 26 and 26 of the fixed support portions 29 extending from the crown prostheses 27 and 28. When the side magnet structures 32 and 32 are fitted, the denture 24 is firmly fixed between the crown prostheses 27 and 28. When the attachment of the partial denture 24 is completed, as in each of the above embodiments, even if the occlusal pressure complicatedly combined with the squeezing acts on the keepers 25 and 25 via the partial denture 24, the partial denture There will be no displacement of the 24 mounting positions. In addition, the magnet structures 32 and 32 swing around the heads 26 and 26 of the fixed support 29, so that the smooth partial mating 24 can be stably performed while maintaining the fixed state of the partial denture 24. Power S can be. In addition, the “panel” that is essential for conventional partial dentures is no longer necessary, so that an appearance with excellent aesthetics can be obtained, and a more stable wearing state and maintainability can be secured even when compared to a bridge. It becomes possible.

FIG. 12 shows that a magnet structure 34 having the shape of a full sphere or a hemisphere is attached to the denture base 30 forming the partial denture 24 using a screw, and the magnet structure 34 is fitted. A keeper 25 is formed by a fixed support portion 36 having a spherical concave portion 35 formed on the tip side, and has a magnet structure. The body 34 and keeper 25 work together to function as a magnetic attachment 33.

[0040] The magnet structure 34 is formed of a rare earth magnet (Nd-Fe-B system: neodymium 'iron' boron magnet) in the same manner as in the above-described embodiment. Thin film or metal plating such as gold or silver is applied. When the partial denture 24 is fitted into the spherical recess 35 of the keeper 25 via the magnet structure 34, the partial denture 24 is firmly fixed to the keeper 25 by the magnetic adhesion force to the magnet structure 34.

 [0041] In such a mounted state of the partial denture 24, a gap t is formed between the outer peripheral surface area S1 of the spherical recess 35 forming the keeper 25 and the peripheral surface area S2 of the magnet structure 34, The magnet structure 34 centered on the spherical recess 35 formed in the fixed support portion 36 of the keeper 25 is allowed to oscillate, and the occlusal pressure complicatedly combined with the squeezing causes the partial denture 24 to The magnet structure 34, which does not cause a displacement of the mounting position of the partial denture 24 even if it acts on the keeper 25 through, swings around the spherical recess 35 of the fixed support portion 36, so that a reliable partial denture can be obtained. Smooth kneading can be stably performed while maintaining 24 fixed states.

 [0042] The present invention is not limited to the configuration examples shown in the above-described embodiments. Each of the above configurations is considered in consideration of the dentition, the number of teeth to be treated, the position, and the like that are different for each patient. Needless to say, an optimal combination of dental treatments can be realized using the magnetic attachment of the present invention.

 Brief Description of Drawings

 [0043] [Fig. L] (a) is a sectional view of a denture and an alveolar bone employing the magnetic attachment of the present invention, (b) is a sectional view of the denture, and (c) is a sectional view of the alveolar bone.

 [FIG. 2] (a) to (d) are explanatory diagrams of the keeper.

 [FIG. 3] (a) is a plan view of a magnet structure, (b) is a sectional view thereof, (c) is a plan view of another magnet structure, and (d) is a sectional view thereof.

 [FIG. 4] (a) and (b) are perspective views showing a mounted state of a denture.

 [FIG. 5] (a) to (d) are explanatory views showing a state of a mounted denture.

[Fig. 6] (a) is an overall plan view of the denture, (b) is a cross-sectional view taken along the line A-A, and (c) is a cross-sectional view of the conventional configuration. FIG.

 [Fig. 7] (a) to (c) are side views showing the shape of the head of the keeper, (d) and (e) are explanatory diagrams showing the wearing of the keeper head, and (f) and (g) are It is explanatory drawing which shows the mounting state of another keeper head.

 [FIG. 8] (a) and (b) are cross-sectional views showing the mounting state of the magnet structure and the keeper, and (c) and (d) are cross-sectional views showing the mounting state of another magnet structure and the keeper.

(9) (a) and (d) are explanatory views showing the state of the mounted denture.

 [FIG. 10] (a) and (b) are explanatory views showing a case where the magnetic attachment of the present invention is applied to a partial denture.

 [FIG. 11] (a) is an enlarged side view of the keeper, (b) is a partially omitted enlarged front view of the keeper, and (c) and (d) are explanatory views showing attachment of the partial denture to which the magnetic attachment of the present invention is applied. In

[FIG. 12] (a) is an enlarged side view showing a mounted state of a partial denture having another configuration, (b) is a partially omitted enlarged front view, and (c) and (d) are applied with the magnetic attachment of the present invention. It is explanatory drawing which shows attachment of the made partial denture.

 [FIG. 13] (a) and (b) are operation explanatory views showing a mounted state of a denture employing a conventional magnetic attachment.

 [FIG. 14] (a) and (e) are explanatory views showing a mounted state of a denture employing a conventional magnetic attachment.

Explanation of symbols

 1 Self

 2 Magnetic damage

 3 teeth

 4 Selfish

 5 Magnet structure

 5a Structure body

 7 M tank bone

8 heads 9 Tooth root 10 Fixed support 11 Key

5b Spherical recess S2 Peripheral surface area S2 Peripheral surface area t Gap

Claims

The scope of the claims  [1] In a magnetic structure provided on a denture base, a keeper made of a magnetic material on which the magnet structure is mounted, and a dental magnetic attachment that also has a force,  A dental magnetic attachment, wherein the magnet structure and the keeper are connected by a ball joint structure.  [2] The ball joint structure is  A spherical convex portion formed in one of the shape of a whole sphere or a hemisphere or a shape between a hemisphere and a whole sphere formed on one of the magnet structure and the keeper, and the magnet structure, The magnetic attachment according to claim 1, wherein a spherical concave portion that is in surface contact with the spherical convex portion and a force are formed on either one of the keeper. [3] The magnetosphere attachment according to any one of claims 1 and 2, wherein the spherical convex portion has a diameter of 1 mm to 8 mm.  [4] The magnetic attachment according to [3], wherein the spherical convex portion has a diameter of 3 mm to 5 mm.  [5] The keeper is composed of a head composed of a spherical convex portion having a spherical shape or a hemispherical shape or any shape between a hemispherical shape and a full spherical shape, and a fixed support portion to be attached to a tooth root position. ,  5. The magnetic attachment according to claim 1, wherein the magnet structure has a spherical concave portion in surface contact with the spherical convex portion. [6] The magnet structure has a spherical convex portion of any shape between a whole sphere or a hemisphere or between a hemisphere and a whole sphere,  The magnetic attachment according to any one of claims 1 to 4, wherein the keeper includes a head having a spherical concave portion that comes into surface contact with the spherical convex portion, and a fixed support portion that is attached to a root position.  [7] The keeper includes a metal head of a prosthesis prosthesis adjacent to the mounting position of the denture, and a head composed of a spherical protrusion having a shape of a whole sphere or a hemisphere, or any shape between a hemisphere and a whole sphere. A fixed support portion extending horizontally from the site, The said magnet structure has a spherical recessed part which surface-contacts with the spherical surface of the said head. The magnetic attachment according to any one of 1 to 4.  [8] The magnet structure has a spherical convex portion of any shape between a whole sphere or a hemisphere or between a hemisphere and a whole sphere,  The keeper includes a head having a spherical contact concave portion on the spherical convex portion, and a fixed support portion extending in a horizontal direction from a metal portion of the crown prosthesis adjacent to the position where the denture is mounted! The magnetic attachment according to any one of claims 1 to 4, wherein the magnetic attachment is misaligned.  [9] When the denture is mounted in the mouth! /, Between the peripheral surface area of the spherical convex part and the peripheral surface area of the spherical concave part, the magnet structure swings with respect to the keeper. The magnetic attachment according to any one of claims 2 to 8, wherein a required gap is formed. 10. The magnetic attachment according to any one of claims 1 to 9, wherein the magnet structure includes a structure body composed of rare earth magnets and a metal film provided over the entire outer surface of the structure body.  11. The magnetic attachment according to claim 10, wherein the metal film is a metal film made of one or a plurality of combinations selected from magnetic stainless steel, gold, silver, titanium, and molybdenum.  12. The magnetic attachment according to claim 1, wherein at least a portion connected to the magnet structure of the keeper is formed of magnetic stainless steel.